Rocky Mountain snowpack changes and their hydrologic consequences during the Holocene

全新世落基山积雪变化及其水文后果

• 批准号: 1903729
• 负责人: Bryan Shuman
• 金额: $ 24.68万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1903729&HistoricalAwards=false
• 关键词: Rocky; Mountain; snowpack; changes; their

Loss of high-elevation snowpack in the intermountain western US poses major societal risks for the region, where increased temperatures may permanently reduce snowpack amounts and impact baseflow in rivers and streams. This research looks towards the geological record of past climates recorded by proxy in organic sediments in lakes and uses this information to provide a perspective on how future water resources in the region will respond to climate change. The past records of the water cycle provide this long-term context to recent changes by analyzing the combinations of temperature and precipitation changes that have impacted snowpack in the past. Such reconstructions can help anticipate future changes. The results of this research will be communicated to broad audiences of stakeholders from public agencies to residents of the region. The research team will work with the University of Wyoming Geology Museum and media outlets, such as Wyoming Public Radio, to present the results through interviews and media. Research and education capacity will be built at the University of Wyoming and at a long-term monitoring site maintained by the US Forest Service.This project will use a novel combination of lake sediment biomarker and mineral analyses to constrain the changes in snowpack, temperature, runoff, evaporation, and dust deposition over the past 11,000 years in three small Rocky Mountain watersheds that are sensitive to climate change. Specifically, the research will develop three new C29 n-alkane (leaf wax) and C23 n-alkane (aquatic) hydrogen isotope records, along with three x-ray diffraction records of lake sediment mineralogy, and three comparable branched GDGT (glycerol dialkyl glycerol tetraether) records of lake water temperature. The combination of these proxies will provide a multi-proxy perspective on changes in Rocky Mountain snowpack, and use to assess climatological and hydrological factors involved in the proxy records. In so doing, the combination of these different types of data will enrich the understanding of the variability of water resources in the western US and the mechanisms underlying these changes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

美国西部山间高海拔积雪的减少对该地区构成了重大社会风险，该地区气温升高可能会永久性地减少积雪量并影响河流和溪流的基流。这项研究着眼于湖泊有机沉积物中代理记录的过去气候的地质记录，并利用这些信息来提供该地区未来水资源将如何应对气候变化的视角。通过分析过去影响积雪的温度和降水变化的组合，过去的水循环记录为最近的变化提供了长期背景。 这种重建可以帮助预测未来的变化。这项研究的结果将传达给从公共机构到该地区居民的广大利益相关者。研究团队将与怀俄明大学地质博物馆和怀俄明公共广播电台等媒体合作，通过采访和媒体的方式展示研究结果。 研究和教育能力将在怀俄明大学和美国林务局维护的长期监测点建立。该项目将采用湖泊沉积物生物标记和矿物分析的新颖组合来限制过去 11,000 年来对气候变化敏感的三个落基山脉小流域的积雪、温度、径流、蒸发和灰尘沉降的变化。具体来说，该研究将开发三个新的 C29 正烷烃（叶蜡）和 C23 正烷烃（水生）氢同位素记录，以及三个湖泊沉积物矿物学 X 射线衍射记录，以及三个类似的支链 GDGT（甘油二烷基甘油四醚）湖水温度记录。这些代理的组合将为落基山积雪的变化提供多代理视角，并用于评估代理记录中涉及的气候和水文因素。这样，这些不同类型的数据的结合将丰富我们对美国西部水资源变化性以及这些变化背后的机制的理解。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。